CCL17 and rheumatoid arthritis: The backtransformed mean plasma CCL17 levels were 120 pg/mL (95% CI: 93.0 to 154), 68.5 pg/mL (95% CI: 47.9 to 98.0), and 172 pg/mL (95% CI: 120 to 246) for AS, HC, and RA patients respectively.